Combination lock box



FIG. 1 is a perspective view of our design;

FIG. 2 is a front view of our design;

FIG. 3 is a rear view of our design;

FIG. 4 is a top view of our design;

FIG. 5 is a bottom view of our design; and,

FIG. 6 is a side view of our design. 

The ornamental design for a combination lock box, as shown and described. 